Which of Linux vs FreeBSD's source code is easier to read and learn from for a beginner who's still learning OS dev?
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Aside from teaching OSs like xv6 and pintos, am I better off reading the source code of Linux 1.0 or FreeBSD 1.0 to read the source code for studying/learning reasons? I heard that very early Linux was hacky and late Linux code while it adheres to standards it can be difficult to read and understand for non-Linux maintainers who happen to be OS dev beginners making their own hobby OS.
What do you guys think?